Clock



FIG. 1 is a front elevational view of a clock showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view with the left side being a mirror image thereof;

FIG. 4 is a to plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a clock, as shown and described. 